PDRM75 Thorn Radiacmeter User Manual And Related Cold War Manuals

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BRITISH

DEFENCE EQUIPMENT

CATALOGUE

THIRD EDITION OCTOBER 1970

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How to use
this Catalogue

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The products shown in this Catalogue are grouped into sections relating
to broadly comparable defence purposes. As far as possible, the sections
themselves are grouped to bring together equipment for naval, army and
air use. On page 3 will be found a list of these section headings with
page numbers.

On pages 9-34 there is a comprehensive index of all the products
included, arranged alphabetically irrespective of section, giving the page
numbers on which descriptive details are published.

On pages 35-56 there is a list of all the firms concerned, arranged
alphabetically. If details of a product or products made by a particular
firm are required, these may be found from the page numbers listed in
the firm's alphabetic list entry. This list also contains more details of the
firms themselves, such as locations of separate divisions or branches, as
well as products not described in this publication.

While every care has been taken to ensure that the data published in
this Catalogue are correct, the publishers accept no responsibility for any
of the information.

The right is reserved to change specifications without prior notice at
any time.

The trade marks and trade names used in this Catalogue must not be
reproduced without permission of the firms concerned. All text and illu¬
strations in this Catalogue are copyright and must not be reproduced
without permission of the publishers.

To our many friends we apologise that this Catalogue is printed only
in English. Where further explanation is required, assistance can always
be obtained from the Embassies of Great Britain, including our Service
Attaches.

Queen's Award to Industry

This symbol, which will be found on many pages in this Catalogue, de¬
notes that the firm concerned has received the Queen's Award to Industry
for outstanding achievements in the year or years indicated under the
symbol.

5

1

Section 6: Other naval equipment

SubIRS (Submarine-Installed Radiac System)

The submarine-installed Radiac system is similar in all
respects to the system for surface vessels, except
that the configuration is modified to suit submarine
requirements.

Equipment

For the measurement of air dose rate a halogen-
quenched Geiger monitor tube is used as the radiation
detector. Its pulses are fed through a transistor
blocking oscillator in the detector unit to provide a
low output impedance and to avoid spurious pick-up in
cables to the control cubicle. Here they are further
amplified and fed to a logarithmic ratemeter-.

The water activity measuring channel is electronically
similar to the air dose rate channel. The unit is mounted
inside the submarine and detects seawater activity
through the hull.

Continuous meter indication of air dose rate and

water activity is provided on a 62 mm dia moving-coil
meter with 100 mm long circular scales.

The magnetic visual alarm indicator shows 'high'
when the preset levels are exceeded. Indication of
power failure is also given.

A block diagram of a typical submarine installation
is shown.

Dimensions

Unit

Description

Size (mm)

Weight

(kg)

Mk 132 AA

Power cubicle

280 x 260 x 80

54

Mk 14 NV

Indicating unit

260 x200 x 100

5

Mk19 NH

Water activity detector

280 dia x 130

20

Mk18 NH

Air detector

150 dia x 80

2

Mk 1 NPB

Plug box

280 x280 x 200

9

Block diagram showing typical system for submarines

General features

The general arrangement and disposition of the
various units making up a SubIRS system will vary
for different types of submarine.

The air detector is intended for mounting in the
snort or fin, as high as possible to avoid the need for com¬
plete surfacing when it is required to check for radio
activity of the air from a submerged submarine.

The water detector of the SubIRS system measures
radioactivity of the seawater through the hull of the
submarine, whereas the water detector of the SIRS
system for surface vessels is fitted in the condenser
cooling water line. Water activity can therefore be
measured in a submarine without the need to run
any pumps, a feature which may be of vital importance
when the submarine is being hunted by surface vessels.

The Mk 1 9 NH water activity detector of the SubIRS
system is therefore larger and heavier than the Mk 26
NH water activity probe of the SIRS system, but
bearing in mind the lack of space in submarines, the
power cubicle and air activity detector of the sub¬
marine system are considerably more compact and
lighter than those of the system for surface vessels. In
the casing of the indicator units important savings in
weight and space have also been achieved without
sacrifice in readability and reliability.

Inter-connection between the various units forming

the system is by standard cabling, so that any pro¬
tection against radiation hazard which may be fitted
within a vessel is not rendered less effective as a result
of installing SIRS or SubIRS.

Audible alarms can be set to respond at any
required level; the SubIRS alarm system can be muted.

170

Section 6: Other naval equipment

Radiation alarm system

for ships and submarines

As long as there is a possibility of nuclear weapons being employed, it is essential for vessels of all types to have
clear warning of radioactivity in air and water, since evidence of radioactive pollution is not always obvious at
sea.The Automation Division of Plessey has developed an alarm system for this purpose available in two versions:
the ship-installed Radiac system (SIRS) and the submarine-installed Radiac system (SubIRS).

SIRS (Ship-Installed Radiac System)

The ship-installed Radiac system provides early
warning and an assessment of the hazards from:

a) direct gamma radiation from a nuclear weapon burst

(including contribution to the total dose from the
neutron 'flash' radiation),

b) gamma-emitting fallout on and around the ship,

c) fallout and induced radioactive contamination in

the sea.

With this information effective NBCD counter¬
measures can be taken and the command is provided
with a full appreciation of the radiological hazard.

The disposition of the detectors in the ship is such
that the monitoring officer can obtain a continuous
picture of the radiation levels throughout the ship,
and hence be able to control evacuation and re-entry of
compartments, produce a casualty forecast, and
advise on the control of watch changing in the
important manned positions.

Detectors of appropriate type are mounted above and
below deck to monitor air activity and below deck to
monitor water activity.

Indicators are normally mounted in the damage-
control headquarters, on the bridge and in the opera¬
tions room. The damage-control HQ indicator
(Mk 1 NVA) displays continuously high and low-level
air dose rates, and integrated air and water activity, gives
visual indication of excess activity for both air and
water and includes facilities for giving audible alarm
if a preset level is exceeded.

The bridge indicator (Mk 3 NV) has red lamp indica¬
tion and audible warning if the preset level is exceeded.

The operations room indicator (Mk 2 NV) repeats
all the data being displayed at the central control
position and has facilities for audible warnings.

Power for the system is provided from a power
cubicle mounted in any suitable position.

Simulator

Provision is made by means of a plug box (Mk 5NX) to
connect a portable simulator (Mk 2NG) into the
system at the remote indicating unit (Mk 2NV)
position, to simulate typical sequences of radiation
effects corresponding to different types of weapons and
conditions, to enable the ship's NBCD organisation
to be exercised. The simulator is set up by using plug-in
boards designed from records of both kiloton and
megaton weapon trials. Manual controls are provided
to vary the effects of washdown and deck shielding.

Unit

Description

Size (mm)

Weight

(kg)

Mk 1 NVA

Indicating unit, damage
control HQ

550 x 420 x 270

60

Mk 2 NV

Indicating unit, opera¬
tions room

300 x 270 x 150

9

Mk 3 NV

Indicating unit, bridge

220 x 150 x 120

5

Mk 118 AA

Power cubicle

750 x 470 x 470

150

Mk 1 NHA

Detecting assembly,
above deck

550 x 470 x 220

53

Mk 2 NHA

Detecting assembly,
below deck

520 x 450 x 200

35

Mk 26 NH

Water activity probe

25-4 dia x 660

4

Typical arrangement of SIRS: (1) Above-deck detector Mk 1 NHA for high-level dose rate, low-level dose rate and total dose. (2)
Below-deck detectors Mk 2 NHA for high-level dose rate and total dose. (3) Water activity detectors Mk 26 NH

THE PLESSEY COMPANY LIMITED

Automation and Transmission Divisions
Sopers Lane, Poole, Dorset, England
Telephone: Poole 51 61 Telex: 41 272

171

Section 6: Other naval equipment

Radiation meter

Portable radiation measuring instrument

Developed for the British Ministry of Defence (Navy),
the Radiac set MD2 is a compact portable instrument
for the measurement of gamma radiation and the
indication of beta radiation. A liquid contamination
measurement accessory is also available.

In addition to the in-built meter indication, an output
is provided to drive a headset or register unit. The
Radiac set is supplied in a rugged transit case, which
also houses a small radioactive check source.

Specification

Power source: three 1-5V dry cells, NATO Stock Number 6135-99-910-1101
Operating temperature range: -10 C to 55 C

Type of indication: 240 circular scale meter with Betalight illumination
Range of indication: 0-1 millirad/h to 1 rad/h
Accuracy: generally ±20%

Detector: four Geiger Muller tubes in parallel
Energy response: ±20% over the gamma range 80 keV to 3 MeV
Check source: radioactive test sample NATO Stock Number 6665-99-521 -1887,
supplied with each equipment to provide functional check facilities
Shock and vibration tests: the instrument is rigorously checked, including the
following vibration search tests:

0- 1 5 Hz at ± 2-4 mm ( x 0 06 in)

10- 30 Hz at 0 8 mm ( ±0-02 in)

30- 80 Hz at x0 4 mm ( ±0 01 in)

80 150 Hz at ± 0 2 mm ( ± 0 005 in)

Drop test: the instrument is dropped from a height of 15 cm (6 in) on each corner
Bump test: 4000 bumps with 2-5 cm (1 in) pre-fall

Packaging: NATO-approved transit case NATO Stock Number 6665-99-521-
1888

Dimensions of packing case: 254 * 445 X 265 mm (10 X 1 1\ X 10 \ in)

Weight, complete with case: 9-1 kg (20 lb)

ELECTRONIC ASSOCIATES LIMITED

Victoria Road, Burgess Hill, Sussex, England

Telephone: Burgess Hill 5101 Cables: Pace Burgess Hill Telex: 87183

174

Section 35: Medical supplies and equipment

Radiation monitors

for medicine, research and health control

Nuclear Enterprises Limited manufactures a very wide range of monitors for measuring radioactivity in man and
in his environment. This activity may have been induced deliberately for diagnostic and medical research purposes,
may result from accidental exposure to radioisotopes or radioactive fall out, or may occur naturally.

Brief descriptions are given of three categories of monitors to illustrate the scope of the range. Many of the
larger systems, however, are constructed to meet particular monitoring requirements after consultation with the
company's systems specialists.

Whole-body monitors

These monitors consist of a shielded detector unit
and an electronic control unit for scanning and record¬
ing of information. Five basic systems are offered:
NE8102 four-crystal scanning counter, and NE8103
large single-crystal counter for general medical diag¬
nostic and research purposes and for reactor and
accelerator personnel monitoring; NE8107 4~ plastic
scintillator counter (the patient is completely surrounded

Scinticamera IME 8251

This equipment is used for examining the distribution
of radioisotope-labelled compounds in the kidneys,
brain, thyroid, liver, and other organs and glands of
the body. It is simple to operate and photographs can
be taken from any angle. Results are obtained in less

Health physics instruments

This extensive range includes: hand and clothing
monitors, dose ratemeters, portable contamination
monitors and neutron dose rate monitors. Three

by the detector) for natural K 40 determination, and the
lower-cost NE8108 and NE8109 'shadow shield'
monitors with minimal shielding for medical diagnostic
work where the highest sensitivity is not essential.
Old steel (pre-1945), free of internal fission product
activity, is used for shielding rooms and all materials
used in monitors are carefully selected for low back¬
ground radioactivity. See illustration opposite.

than two minutes with a Polaroid camera. Automatic
dynamic sequences of pictures can be taken with
frame speeds up to three pictures per second. Com¬
puters and other data analysis systems are available
as shown opposite, bottom left.

monitors are described below. All were developed
in co-operation with the United Kingdom Atomic
Energy Authority at Harwell, England.

0075 neutron monitor

The 0075 neutron monitor is a light-weight, self-
contained. portable (it can be held in one hand),
battery-operated instrument designed to measure
neutron dose equivalent rate over a wide range of
neutron energies while having a negligible response
to gamma radiation. Its gamma rejection ratio is
better than 3000:1 up to at least 1 r/h for a photon
energy of 100 keV. Readings are on a quasi-
logarithmic scale calibrated from 0 5 mrem/h to
1 rem/h

0030 beta-gamma doserate meter

This is a general-purpose doserate meter which
gives reliable and accurate readings of beta and
gamma radiation over a wide energy range It is
light and portable and operates on a U2 flashlight
battery. Its simple controls make it suitable for use
in laboratory or factory. It incorporates a high-
stability thin-window ion chamber and is radio¬
frequency shielded for use with linear accelerators
and betatrons. Its range is 1 mr/hto8r/h

2601/2602 gamma radiation monitors

These are single-range portable instruments to
measure radiation levels of the order of 5//rad/h to
lOmrad/h (2601), and 100//rad/h to 200 mrad/h
(2602). Fully transistorised, battery-operated and
easy to operate and read, the instruments are
particularly suited to radiation surveying and con¬
tamination monitoring in accordance with current
statutory ionising radiation requirements. They
have a Geiger-Muller tube as detector, which is
fitted with special correction filters so that doserate
indication remains accurate within 20% over the
energy range 45 keV to 3 0 MeV

&

1966

NUCLEAR ENTERPRISES LIMITED

Sighthill, Edinburgh, EH11 4EY, Scotland
Telephone: 031-443 4060 Cables: Nuclear Edinburgh

Telex: 72333

677